Machine for forming solids of revolution.



H. N. MOTSINGER.

MACHINE FOR FORMING SOLIDS 0F REVOLUTION.

APPLICATION FILED JAN. 29. 1914.

1,148,61 1 Patented Aug. 3, 1915.

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H. N. MOTSINGER.

MACHINE FOR FORMING SOLIDS 0F REVOLUTION.

APPLICATION FILED IAN.29| I914.

Patented Aug. 3, 1915.

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HOMER N. MOTSINGER,

OF LA FAYETTE,

INDIANA.

MACHINE FOR FORMING SOLIDS OF REVOLUTION.

Specification of Letters Patent.

Patented Aug. 3, 1915.

Application filed January 29, 1914. Serial No. 815,154.

To all whom it may concern Be 1t known that T, HOMER N. MOTSINGER,

a citizen of the United States, residing at La Fayette, in the county of Tippecanoe and State of Indiana, have invented a new and useful Machine for Forming Solids of Revolution, of which the following is a specification.

The object of my invention is to produce an apparatus by means of which bodies of revolution may be accurately produced in desired axial section.

The apparatus has been especially designed to facilitate the accurate production of comparatively small needle valves having such axial section that a given axial movement of the valve relative to the opening which it throttles, at any point within the entire effective movement of the valve,

may cause uniform increment or decrement drawings illustrate my embodied by the use of parts of an ordi nary watch makers lathe, said lathe comprising a main horizontal body 10 carrying a head stock 11 at one end, the spindle 12 of said head stock serving to receive the article 13 which is to be accurately formed. Longitudinally slidable upon the main body 10 is a carriage 14 which is normally urged in one direction by means of a able 15 passing over an idler 16 and provided with a weight 17, this weight, serving to retract the forming tool 18 from the work. Carriage 14 is provided with a pair of bars 19, 19 which are extended along and beyond the head stock 11 and connected at their ends by a cross bar 20 which carries a hardened wearing plate 21 which lies at right angles to the axis of the head stock and line of movement of the carriage 14.

Adjacent the outer ends of bars 19, the main body 10 carries a bracket 22 which forms a support and guide for a lever 23 which may be pivoted to bracket 22 either at 24 or 25. Slidably mounted upon lever 23 is a head 26 which carries a knife edge 27 arranged to be engaged by the wearing plate 21 and the head 26 is longitudinally adjustable along lever 23, its position being gaged by its relation to the scale 2-8. Lever 23 also carries a knife edge 29 which is arranged in opposition to the knife edge 27 and e11- gages the hardened end of a shaft 30 pro vided with a threaded portion 31 which engages a nut 32 carried by the head stock 11, the arrangement being such that weight 17 holds the wearing surface 21 at all times in'engagement with knife edge 27 and, operating through said knife edge and lever 23, holds knife edge 29 against the end of shaft 30.

The forming tool 18 is carried by any desired form of tool post 35 mounted upon a carriage 36 which is slidably mounted upon a head 37 conveniently arranged parallel with the line of movement of carriage 14, the head 36 being longitudinally adjustable on this head 37 by the usual adjusting screw 38. The head 37 is slidably mounted upon a guide or track 39 forming a part of carriage 14 and preferably arranged at right angles to the line of movement of carriage 14 and in order to obtain proper adjustments of the tool, the connection between head 37 and slide 39 is by means of an intermediate head 37 upon which the head 37 is adjustable by means of the usual adjusting screw 40. The intermediate head 37 is directly slidable upon a guide 39 and carries a rod 41 which is equipped with a knife edge 42, the edge of whichis vertical and engages a wearing block 43 carried by a horizontally swinging lever 44. The knife edge 42 is constantly urged against the wearing block 43 by means of a spring 45 this movement being in a direction which serves to urge the forming tool 18 away from the axis of the work 13. Lever 44 is pivotally supported at 46 upon a bracket 47 which is attached to carriage 14 and is preferably adjustable upon said carriage parallel with the axis of the work 13 and with the line of movement of the carriage 14. Lever 44, at its free end, carries a wearing block 48 having a vertical knife receiving face which is presented oppositely to the wearing face of block 43 and this wearing block 48 is held constantly in engagement with a knife edge 49 by means of a cord 50 passing over an idler 51 and equipped with a weight 52. The knife edge 49 is carried by a horizontally movable slide 53 which is mounted in guide ways 54 carried by carriage 14 at right angles to the line of movement of the carriage 14 and this slide 53 carries a finger 55 which is arranged to engage a master cam 56 carried by a master shaft 57 journaled in bearings 58 carried by carriage 14. The shaft 57 is provided in order to communicate motion to the screw shaft 30 and is, therefore, preferably in substantial alinement with the shaft 30 but, in order to provide for relative axial movement between these shafts, the connection between the two is by means of a pin coupling 59 carried by shaft 57 and a diametrical slot 60 formed in shaft 30. A stud shaft 61 carried by the carriage 14 has journaled upon it driving pulley 62 carrying a pinion 63 which meshes with a gear 64 journaled upon shaft 57, the pinion 63 being preferably very much smaller than gear 64 as indicated in Fig. 2. Attached to shaft 57 is a lever 65 by means of which the shaft may be turned by hand and this lever is provided with a coupling pin 66 by means of which gear 64 may be connected to shaft 57, the pin 66 entering any one of a series of holes 67 formed in gear 64. Pin 66 is normally urged mwardly by a spring 68 (dotted lines Fig. 1) and is provided with a laterally P10]6Cl3111g pin 69 which, when it comes in contact with a rod 70, serves to automatically withdraw pin 66 from any hole 67 and thus stop rotation of shaft 57.

In operation, it has been found that the most accurate results can be obtained when the forming tool is started at the smallest diameter of the work and withdrawn from the axis during the forming motion, but it will be understood, of course, that a reversal of this operation would not depart from my invention.

In operation, shaft 57 will be turned (counter-clockwise, Fig. 2) until the desired initial point X on the cam is brought opposite finger 55 and gear 64 is rotated until engagement can be had between the gear and lever 65 with. the cam in this lIlltlal'pO- sition. Thereupon, tool 18 is brought, by proper manipulation of the adjusting screws 38 and 40, to the initial position relative to the work 13. In this connection it may be said that in order to obtain the highly accurate results which I desire in the production of the particular needle valves for which the machine was primarily designed, I have found it desirable to approximately form the needle valve by less accurate mechanism, although the whole forming operation may be accomplished in the single apparatus if desired. The spindle 12 of the I head stock will, of course, be rotated and when the initial position of the parts has been attained, pulley 62 will also be rotated in the direction indicated by the arrow. There is, however, no need of any synchronism between spindle 12 and pulley 62. As pulley 62 rotates, cam 56 will be rotated beneath the finger 55 and this will cause slide 53 to yield under the action of the weight 52. The lever 44 will thus be swung and block 43 will yield before knife edge 42 and the tool 18 will thus be retracted from the axis of the work the amount of this retraction being in direct proportion, though reduced, to the variation in radial dimension of the cam 56. At the same time screw 31 is i 'otated in nut 32, and, operating upon knife edge 29 and through lever 23 upon knife edge 27 and plate 21, the entire carriage 14, and therefore the tool 18, is moved axially of the work in exact proportion to the axial movement of shaft 30. The pitch of screw 31 is not material because any desired axial movement of the tool is obtained by a proper relationship between the two knife edges 27 and 29 and the fulcrum of lever 23. In the arrangement shown in Fig. 1, the axial movement of the tool is less than the axial movement of shaft 30 but if a greater movement is desired, the lever 23 will be pivoted at the point 25 instead of the point 24. The desired axial movement of the tool is completed before a complete rotation of cam 56 has been accomplished and by that time finger 69 has come into contact with stop 70 and rotation of shaft 57 is thus arrested. The cam 56 may, of course, be given any desired circumferential extent although the actual axial movement of the forming tool be very small and consequently variations of shape of the article 13 which extend almost infinitesimal distances axially of the article are nevertheless produced during a very considerable circumferential movement of the master cam and consequently extreme nicety of form of the article 13 may be obtained because of the possibility of satisobtained between'the axial length and the diameter of the article 13 which is to be formed while nevertheless preserving the fundamental character of the bounding line of the article relative to the axis. By shifting block 26 uponv lever 23, the length of the article may be varied while the initial and final diameter remains the same; and by shifting bracket 47 the maximum diameter may be increased or diminished while the length of the article remains the same, and by shifting both the block 26 and the bracket 47, variations may be made in both the length and maximum diameter of the article; the cross section of the article, however, at all times retaining the fundamental characteristic which is established by the shape of the cam 56 and, because of the great circumferential extent of the cam 56, the accuracy of production of the article 13 may very greatly exceed the capacity of detection of the measuring instruments commonly used.

In practice, in determining the proper form of the master cam 56 for a machine for the production of carbureter needles, a cam approximating the desired shape is produced; a needle produced from such cam; the needle then placed within a delivery nozzle and the delivery carefully tested and checked for successive lifts of the needle and, by experimentation the character of delivery is determined and the cam 56 is modified to produce necessary changes in the form of the valve as found by such experimentation.

I claim as my invention:

1. In machine for producing solids of revolution, the combination with means for rotating the article, a tool holder cooperating therewith, a member independent of the article-rotating means, and two proportionately variable connections between said member and tool holder one operating to shift the tool holder axially of the article and the other operating to shift the tool holder transversely relative to the article.

2. In a machine for producing solids of revolution, the combination with a rotatable holder for the article, a tool holder cooperating with said article, a carrier for said tool holder slidable axially of the article, a cam, a lever engaging said carrier, a connection between said cam and the lever for swinging said lever, a supplemental carrier mounted upon the first mentioned carrier for. shifting the tool holder laterally of the article, a second lever, connections between said second lever and said second supplemental carrier, and connections between the cam and said second lever for swinging said second lever.

3. In a machine for producing solids of revolution, the combination with a rotatable work holder, of a slide shiftable axially of the work holder, a forming tool carried by said slide, a lever swinging in a plane parallel with the axis of the work holder, a threaded shaft axially shift-able parallel with the axisof vthe work holder, interengaging portions carried by said shaft and lever and by said lever and tool carrier, and means for rotating said threaded shaft.

4. In a machine for producing solids of revolution, the combination with a rotatable work holder, of a tool holder shiftable both laterally and longitudinally of the axis of the work holder, a lever arranged to swing toward and from the axis of the work holder, a cam, interengaging parts between said lever and tool holder and between said cam and lever, a second lever arranged to swing longitudinally of the axis of the work holder, connections between said lever and work holder, and means coordinated with the master cam for controlling said lever.

5. In a machine for producing solids of revolution, the combination with a rotatable work holder, of a tool carrier slidable parallel with the axis of the work holder and slidable transversely of the axis of the work holder, a lever arranged to swing in a plane parallel with the axis of the work holder, a threaded shaft axially movable parallel with the axis of the work holder, interengaging portions between said threaded shaft and said lever and between said lever and that portion of the tool holder which is slidable parallel with the axis of the work holder, a second lever arranged to swing toward and from the axis of the work holder, interengaging connections between said second lever and that portion of the tool holder which is shiftable laterally of the work holder, a rotatable cam, intermediate connections between said cam and the threaded shaft to transmit the rotation of the cam to said threaded shaft, and intermediate connections between the cam surface of said master cam and the second lever to transmit variations in said cam surface to said second lever.

6. In a machine for producing solids of revolution, the combination with means for rotating the article, of a tool holder eooperating therewith, a cam, and two proportionately variable shifting means associated with said tool holder one operating to shift the tool holder axially of the article and the other operating to'shift the tool holder transversely relative to the article, one of said shifting means being actuated by the cam and the other of said shifting means being actuated by a member coordinated with-said cam.

7. In a machine for producing solids of revolution, the combination with means for rotating the article, of a tool holder cooperating therewith, a cam, and two shifting means associated with said tool holder one operating to shift the tool holder axially of the article and the other Operating to my hand at Indianapolis, Indiana, this, shift the tool holder transversely relative to twenty-third day of January, A. D. one the article, one of said shifting means being thousand nine hundred and fourteen.

actuated by the cam and the other 01"; said HOMER N. MOTSINGER. shifting means being actuated by a member Witnesses: coordinated With said cam. ARTHUR M. H001),

In Witness whereof, I have hereunto set FRANK A. FAHLE.

copies of this patent may be obtained for five cents each, by addressin g the Commissioner of Patents, Washington, D. C. 

